[PATCH 2/2] block: skip the fsync_bdev call in del_gendisk for surprise removals

[Christoph Hellwig]

On Wed, Feb 16, 2022 at 04:18:43PM +0100, Hannes Reinecke wrote:
> My turn to be picky:
> In the previous patch you use 'set_bit()' for GD_DEAD, which to my 
> knowledge doesn't imply a memory barrier.
> Yet here you rely on that for the 'test_bit()' to return the correct/most 
> recent value.
> Don't we need a memory barrier here somewhere?

Well, we only do the test to skip useless work.  A race is not a
problem here.